* {
  margin: 0;
  padding: 0;
  list-style: none;
}

.orange {
  width: 100px;
  height: 100px;
  background: orange;
}

.skyblue {
  width: 100px;
  height: 100px;
  background: skyblue;
}

.red {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: red;
}
